JP4583284B2 - Curve propulsion method and main jack used in the method - Google Patents

Description

  The present invention relates to, for example, a curve propulsion method for constructing a curved portion in a culvert such as a sewer, a drainage channel, and an underpass, and a main jack used in the construction method, and particularly suitable for constructing a sharp curve portion in a culvert. The present invention relates to a simple curve propulsion method and a main jack used in the method.

Conventionally, a propulsion method is known as a method for constructing a culvert.
In this propulsion method, the excavating means is disposed on the tip side of the tubular culvert construction member installed in the ground, while the main push jack is installed on the rear end side of the culvert construction member. The culvert is constructed by excavating the earth and sand with the excavation means while pushing forward the culvert construction member. (For example, see Non-Patent Document 1 and Non-Patent Document 2)
http://www.kidoh.co.jp/koudou/kankyo.htm http://www.pref.shiga.jp/d/konanryuiki/suisin_method.htm

By the way, although the undercarriage needs to construct a curved part depending on the construction location, the original push jack in the construction method of the non-patent document 1 and the non-patent document 2 operates linearly, and its origin. The entire pressing surface of the push jack is brought into contact with the pressed surface of the culvert construction member, so that the pressing force of the original pushing jack is applied to the entire pressed surface.
That is, in the pushing operation of the main push jack with respect to the culvert construction member when constructing the curved portion, the forward direction of the culvert construction member changes, so that the entire pushing surface of the push jack does not contact the pushed surface. There is a possibility that the pressing force of the main pushing jack may be partially concentrated on the pressed surface of the culvert building member or may not be transmitted efficiently.
For this reason, when constructing a curved portion in a culvert, as a method of reliably transmitting the pushing force of the main push jack to the culvert construction member, between the pushed surface of the culvert construction member and the push face of the push jack A method is adopted in which a cushioning material is interposed between the two and the cushioning material is adjusted so as to correspond to the arc of the curved portion so that the pressing force of the main pushing jack is applied to the entire pressed surface.
However, the above method is effective to some extent for constructing a curved section in a small-section underdrain with a small number of main push jacks, but when constructing a curved section in a large-section underdrain, Since the construction member also becomes large and the number of jacks increases, the construction work of the curved portion is inefficient.

  Therefore, an object of the present invention is to efficiently construct a curved portion of a culvert in a large cross section, and an object of the present invention is to provide a propulsion method for the curved portion that solves this problem and a main jack used in the method.

In order to achieve the above object, the present invention employs the following technical means. As a first aspect of the invention, in the propulsion method for constructing a curved portion in a culvert by advancing the culvert construction member in the ground with a main push jack, the culvert construction member is disposed along the pushed surface around the edge of the culvert construction member. With the advancement of the culvert construction member by a plurality of push jacks consisting of cylinders, the guide members arranged on the left and right of the wellhead guide the culvert construction member in a curved shape, and the pusher is moved along the curve movement of the culvert construction member. By inclining the pushing surface of the jack in the left-right direction, the pushing surface and the pushed surface of the culvert member are brought into direct contact with each other so that the pushing force of the pushing jack acts on the entire pushed surface. This is a propulsion method characterized by

Further, as the structure of the main pushing jack for realizing the propulsion method of the first invention, in the second invention, in the second invention, a plurality of substantially cylindrical shapes arranged along the pushed surface around the edge of the culvert building member. Each of the push jacks follows the angle of the pushed surface where the push surface of each push jack changes due to the curvilinear advance of the culvert construction member, This is a main push jack characterized in that it is pivotally supported so as to be able to tilt left and right so as to come into contact in a face-to-face manner.
Furthermore, as another structure of the main pushing jack for realizing the propulsion method of the first invention, in the third invention, a plurality of substantially arranged so as to be along the pushed surface around the edge of the culvert building member. It is a main push jack including a cylindrical push jack, and the push face of each push jack follows the angle of the push face that changes due to the curvilinear advance of the culvert construction member, and faces the push face. It is made into the main pushing jack characterized by being supported so that it can incline right and left so that it may contact.

In addition, from the viewpoint of ensuring the stroke of the main push jack and making it compact in the contracted state of each push jack, in the fourth invention, the main push jack includes the push jack, the support jack, and both The push jack and the supporting jack are configured as a cylinder having a two-stage expansion / contraction structure including an outer tube portion and an inner flange portion that can be projected and retracted with respect to the outer tube portion. The push jack is set in a direction in which the inner flange portion extends and contracts forward, and the outer tube portion is pivotally supported on the support body so as to be tiltable to the left and right, while the support jack is set in a direction in which the inner flange portion extends and retracts rearward. Thus, the outer tube portion is immovably supported with respect to the support body, and is a main pushing jack.

In the 3rd invention, although the arrangement | positioning aspect of a push jack and a support jack is arbitrary, from a viewpoint that push operation with respect to the reef construction member of a former push jack is performed with sufficient balance, in 5th invention, a push jack and a support jack are This is a push jack characterized by being alternately supported with respect to the support.

  The culvert construction member referred to in the present invention is a concrete or metal tubular body or box culvert for constituting a sewage channel, drainage channel, underpass or the like by a culvert.

According to the present invention, the following excellent effects can be expected.
According to the first aspect of the present invention, the pushing surface of each push jack changes to the angle of the pushed surface that is changed by the forward movement of the undercut construction member in accordance with the pushing operation of the push jack and the curve movement of the dusk construction member by the guide member. It follows, and it inclines so that the said to-be-pressed surface may contact in a face-to-face shape.
Therefore, the pushing surface of the jack always faces the pushed surface of the culvert building member, so that the curved portion of the culvert in the large cross section can be efficiently constructed.
Moreover, according to the 2nd invention and the 3rd invention, the main pushing jack which can implement | achieve the propulsion method of 1st invention can be provided.
According to the fourth aspect of the present invention, the stroke of the main jack can be secured, and the main jack can be made compact in the contracted state of each push jack.
Moreover, according to 5th invention, the pushing operation | movement with respect to the reef construction member of a former pushing jack can be performed with sufficient balance.

Hereinafter, the best mode for carrying out the curve propulsion method of the present invention and the main jack used in the method will be described with reference to the drawings.
In this embodiment, the configuration of the main jack used in the curve propulsion method will be described first, and then the curve propulsion method using the main jack will be described.
Moreover, the culvert construction member illustrated in this embodiment is a box culvert.

  As shown in FIGS. 1 to 3, the main push jack 1 of this embodiment includes a plurality of push jacks 2 that directly push the culvert construction member A and a plurality of support jacks that push the culvert construction member A through the push jack 2. 3, a support plate 4 for supporting these jacks, a push plate member 5 fixed to the tip of the push jack 2, and a support plate member 6 fixed to the tip of the support jack 3.

The push jack 2 and the support jack 3 are of a cylindrical shape having a two-stage expansion / contraction structure including outer tube portions 21 and 31 and inner flange portions 22 and 32 that can be projected and retracted with respect to the outer tube portions 21 and 31. .
The push jack 2 and the support jack 3 are supported by the support plate 4 at substantially the center portions of the outer tube portions 21 and 31, and the push jack 2 has the inner flange portion 21 extending forward (the culvert construction member A side). On the other hand, the support jack 3 is supported as a direction in which the inner flange portion 31 extends rearward (the bearing wall B1 side in the start-up resistance B).
The push jack 2 is pivotally supported so that the outer tube portion 21 can be tilted to the left and right with respect to the support plate 4, and the support jack 3 is supported by the outer tube portion 31 so as not to move relative to the support plate 4. Has been.
As shown in FIG. 3B, the inclination operation of the outer tube portion 21 by the shaft support of the outer tube portion 21 is such that the outer tube portion 21 is inclined in accordance with the propulsion direction in the curve of the culvert building member A. When the push plate member 5 is inclined along with the inclination, the push surface 51 of the push plate member 5 is directly opposed to the pressed surface A1.
Further, the push jack 2 and the support jack 3 are arranged so as to be staggered with respect to the support plate 4.

The support plate 4 is formed in a substantially rectangular hollow box having a front square shape, and the outer tube portions 21 and 31 are disposed in a penetrating manner from the front surface to the lower surface.
A shaft support portion 41 is provided on the front surface of the support plate 4 to pivotally support the outer tube portion 21 so that the outer tube portion 21 can be tilted to the left and right. A long hole 42 is opened.

The pressing plate member 5 is formed in a frame shape along the pressed surface A1 secured on the rear end surface of the culvert building member A, and a surface (front surface) facing the pressed surface A1 is a pressing surface 51.
Further, on the rear surface of the push plate member 5, a connecting portion 5 </ b> A that is connected to the tip of the inner flange portion 22 in the push jack 2 is disposed.
The connecting portion 5A of the present embodiment is configured to connect the push plate member 5 to the inner collar portion 22 so as to be inclined, and specifically, has a ball joint structure.
That is, the push plate member 5 is tiltably coupled to the inner collar portion 22 by fitting the ball member 5C across the coupling portion main body 5B in the coupling portion 5A and the distal end of the inner collar portion 22. .
As shown in FIG. 3 (c), the inclination operation of the push plate member 5 by the connecting portion 5A adjusts the extension length of each inner collar portion 22 in accordance with the propulsion direction in the curve of the culvert construction member A. By inclining the pressing plate member 5, the pressing surface 51 of the pressing plate member 5 is made to face the pressed surface A1.

The support plate member 6 has the same shape as the push plate member 5, and is opposed to the bearing wall B <b> 1 in the start-up resistance B at the tip of the inner flange portion 32 of the support jack 3. It is fixed to.
Further, when the main push jack 1 is disposed in the start-up resistance B, the support plate member 6 is disposed so as to be opposed to the bearing wall B1 in the start-up resistance B.

According to the main push jack 1 of this embodiment, the push jack 2 and the support jack 3 having a two-stage stretchable structure are stretched in opposite directions with respect to the support plate 4, and the outer tube portions 21 and 31 are substantially omitted. Since it is supported by the central portion, it can be made substantially the same length as a jack having a three-stage stretchable structure in the extended state.
That is, the main push jack 1 of the present embodiment is substantially the same length as the jack of the three-stage stretchable structure in the extended state, while the push jack 2 and the support jack 3 are actually of a two-stage stretchable structure. Therefore, the diameter of the inner flange portions 22 and 32 serving as the minimum diameter portion can be made larger than the diameter of the inner flange portion serving as the minimum diameter portion in the jack having the three-stage expansion / contraction structure. The load capacity against the weight and excavation resistance of the culvert construction member A is improved, and even in the contracted state, it is equivalent to the total length of the jack with the three-stage contraction structure, so that it has a compact contraction with excellent load resistance. It is the former push jack 1 which realized the state.
Furthermore, according to the former push jack 1 of this embodiment, the left and right inclination of the outer tube portion 21 and the right and left inclination of the push surface 51 follow the pushed surface A1 of the underdrain construction member A that changes by propelling in a curved shape. ,
It is possible to maintain the facing state of the pressing surface 51 with respect to the pressed surface A1.
That is, the main pushing jack 1 of the present embodiment can efficiently transmit the pushing force to the underdrain construction member A that promotes the pushing force in a curved shape, and therefore, it is possible to efficiently construct the undercut curve portion in the large cross section.

Next, the curve propulsion method using the main pushing jack 1 exemplified in the above embodiment will be described with reference to FIGS. In addition, the site | part shown with a virtual line in a figure shows the propulsion | direction direction of the culvert construction member A, and actually, while pushing the culvert construction member A with the main push jack 1, the top culvert construction member A It digs through the ground by excavation means (not shown) arranged at the front end. The underdrain construction member A is a box culvert that is bent so as to curve leftward in a plan view. In addition, guide members CL and CR (see FIGS. 1, 4, and 5) that guide propulsion of the culvert building member A in the curvilinear direction are disposed on the left and right of the wellhead B < b > 2 in the start-up reaction B.

As shown in FIG. 4A, the curve propulsion method according to this embodiment fixes the main push jack 1 to the support wall B1 in the start-up resistance B in a face-to-face manner as shown in FIG. Thus, the pushing surface 51 of the main pushing jack 1 is made to face the pushed surface A1 of the culvert building member A placed in the start-up resistance B.
At this time, the guide members CL and CR are in contact with the left and right side portions of the culvert building member A.

Subsequently, as shown in FIG. 4 (b) from the state of FIG. 4 (a) as a second step, the main push jack 1 is actuated to extend the push jack 2 and the support jack 3 and push the culvert construction member A. Then, the culvert construction member A is guided by the guide members CL and CR and digs in the ground while being guided in the curve direction.
At this time, as the culvert construction member A advances in a curved shape, the angle of the pressed surface A1 of the culvert construction member A changes, but the extension length of the inner flange portion 22 in each push jack 2 is adjusted, and the push jack By inclining the pressing plate member 5 in 2 via the connecting portion 5A, the pressing surface 51 of the pressing plate member 5 faces the pressed surface A1 whose angle changes.

  Furthermore, as shown in FIG. 5 (c) as the third step, the outer tube portion 21 in each push jack 2 is inclined with the angle of the pushed surface A1 that is further changed by pushing the culvert construction member A. The pressing surface 51 of the pressing plate member 5 faces the pressed surface A1 whose angle changes.

  And as shown in FIG.5 (d) as a 4th process, when the push jack 2 and the support jack 3 in the main push jack 1 are extended to the limit, the said push jack 2 and the support jack 3 are contracted, By returning the main pushing jack 1 to the state shown in FIG. 4 (a), placing the next undercarriage construction member A in the start-up reaction B, and repeating the steps shown in FIGS. 4 (a) to 5 (d), Curved culverts can be constructed.

According to the propulsion method of the present embodiment, the pressing surface 51 is inclined by the inclination of the pressing surface 51 of the pressing plate member 5 along with the changing angle of the pressed surface A1 of the culvert construction member A that is propelled while drawing a curve. The pressing plate member A1 can always face the pressing plate member A1.
Therefore, it is possible to efficiently construct the dark curve portion in the large cross section.

It should be noted that the present invention is not limited to the illustrated embodiments, and can be implemented with configurations within a range that does not deviate from the contents described in the respective claims.
For example, as a structure in which the pushing surface 51 is always directly opposed to the pushed surface A1, in the embodiment, the outer tube portion 21 in the pushing jack 2 and the pushing plate member 5 in the pushing jack 2 are inclined. However, the present invention may have a structure in which either the outer tube portion 21 or the push jack 2 is inclined.
The underdrain construction member A exemplified in the above embodiment is a box culvert having a quadrangular cross section. However, in the present invention, the underdrain construction member A may be a tubular body having a circular cross section. And it is preferable to make the support plate member 6 into a circular annular shape.

The installation state of the main pushing jack which concerns on this invention is shown. FIG. 2 is a sectional view taken along line (2)-(2) in FIG. 1. It is a front view which shows the movement of a main pushing jack, (a) shows the expansion | extension state of the linear direction of a pushing jack and a support jack, (b) shows the inclination state of a pushing jack, (c) is the inclination of a pushing plate member. Indicates the state. It is process drawing which shows the propulsion method concerning this invention, (a) shows a 1st process, (b) shows a 2nd process. FIG. 5 is a process diagram continuing from FIG. 4, (c) shows the third process, and (d) shows the fourth process.

Explanation of symbols

1: former push jack A: underdrain construction member 2: push jack 3: support jack 4: support plate 5: push plate member 6: support plate member 21: outer tube portion 31: outer tube portion 22: inner flange portion 32: inside Saddle B: Starting resistance B1: Bearing wall 41: Shaft support 42: Guide slot A1: Pushed surface 51: Push surface 5A: Connecting portion CL: Guide member CR: Guide member

Claims (5)

In the propulsion method of constructing a curved portion in a culvert by advancing the culvert construction member in the ground with a main push jack, a plurality of cylinders arranged along the pushed surface around the edge of the culvert construction member By the advancement of the culvert construction member by the push jack, the guide members arranged on the left and right of the wellhead guide the culvert construction member in a curved shape, and the push face of the push jack is moved to the left and right as the culvert construction member moves in the curve. By tilting in the direction, the pressing surface and the pressed surface of the culvert member are brought into direct contact with each other, and the pressing force of the push jack is applied to the entire pressed surface. Promotion method.   A push jack used in the propulsion method according to claim 1, wherein the push jack includes a plurality of substantially cylindrical push jacks arranged along a pushed surface around an edge portion of a culvert construction member. Each push jack can be tilted right and left so that the pushing surface of each pushing jack follows the angle of the pushed surface that changes due to the curvilinear advance of the culvert construction member, and comes into direct contact with the pushed surface. A push jack that is pivotally supported.   A push jack used in the propulsion method according to claim 1, wherein the push jack includes a plurality of substantially cylindrical push jacks arranged along a pushed surface around an edge portion of a culvert construction member. The push surface of each push jack is supported so that it can be tilted to the left and right so as to follow the angle of the pushed surface that changes due to the curved advance of the culvert construction member and to come into direct contact with the pushed surface. The original push jack characterized by. The main push jack includes the push jack, a support jack, and a support body that supports both of the jacks, and the push jack and the support jack can protrude and retract with respect to the outer tube portion and the outer tube portion. It is configured as a cylinder having a two-stage expansion / contraction structure composed of an inner flange portion, and the push jack is pivotally supported on the support body so that it can be tilted to the left and right in a direction in which the inner flange portion expands / contracts forward. Meanwhile, the support jack, inner rod portions is described outer tube portion in the direction of stretch backwards in claim 2 or claim 3, characterized by comprising supporting the immovable manner with respect to said support Former push jack.   5. The push jack according to claim 4, wherein the push jack and the support jack are alternately supported with respect to the support body.

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